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EZO Universal Flow Meter Totalizer Circuit Reads Reads flow rate per second, minute, hour and total flow. Works with any off the shelf pulsed DC flow meter regardless of manufacture Works with any DC pulse per volume flow meter Works with any DC pulse frequency to volume flow meter Programmable with up to 16 integer or floating point K factors On the fly linear interpretation between K factors for maximum accuracy Visual display indicating real time turbine rotation 1K, 10k or 100k on board pull-up or pull-down resistors(for flow meters that require external pull-up or pull-down) Comes pre programed with 4 different Atlas Scientific flow meters Data format is ASCII Data protocol UART asynchronous serial connectivity (RX/TX voltage swing 0-VCC) Operating voltage: 3.3V to 5 Sleep mode power consumption 2.1mA at 3.3V Circuit Specs Dimensions: 14.02mm x 20.33mm (0.55" x 0.80") Weight: 1.76 grams